Attenuation of lamb waves in the vicinity of a forbidden band in a phononic crystal

Author

Bavencoffe, Maxime ; Hladky-Hennion, Anne-Christine ; Morvan, Bruno ; Izbicki, Jean-Louis

Author_Institution

Lab. Ondes et Milieux Complexes, Univ. of Le Havre, Le Havre, France

Volume

56

Issue

9

fYear

2009

fDate

9/1/2009 12:00:00 AM

Firstpage

1960

Lastpage

1967

Abstract

When a Lamb wave propagates on a plate engraved by a periodic grating, it may exhibit attenuation. This attenuation is related to a coupling of this incident mode with other propagating modes. As the propagation takes place in a periodic medium, the dispersion curves of the modes are of interest because they exhibit passbands and stopbands related to the geometry of the waveguide. The goal of this work is to quantitatively establish the relation between the value of the attenuation of the propagating waves and the width of the forbidden bands appearing inside the Brillouin zone. This study is performed by using a finite element method (ATILA code).

Keywords

Brillouin zones; finite element analysis; phononic crystals; surface acoustic waves; ATILA code; Brillouin zone; Lamb wave attenuation; Lamb wave propagation; finite element method; forbidden band; periodic grating; periodic medium; phononic crystal; Attenuation; Finite element methods; Geometry; Gratings; Passband;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2009.1272

Filename

5278446